@mammusic have you had a Cystatin C GFR done? It is higher than the creatinine based eGFR usually done, for me, which is more affected by hydration and muscle changes. My Cystatin C is stable but my creatinine-based eGFR fluctuates.

My nephrologist also says my low blood pressure lowers the eGFR so we can't win? We need a Goldilocks "just right" bp I guess!